Drinking water quality · 2024
· Verified
What's in Joliet, IL tap water
16 contaminants were measured in the Joliet, IL water system's 2024 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 16
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Manganese
- Service area
- IL
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Joliet, IL
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)near national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Joliet, IL's drinking water comes from ground water, drawn from 26 sources.
Source
- WELL 5D
- WELL 6D
- WELL 7D
- WELL 8D
- + 22 more
Treatment
- TP09-HMO WELLS 11D,23D
- TP10-HMO WELL 12D
- TP11-HMO WELL 15D
- + 8 more
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Joliet, IL
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
GROSS ALPHA worst: 2019 | 21.3 pCi/L 1.4× | 15 pCi/L | '19 |
RADIUM 226 228 worst: 2014 | 6.9 pCi/L 1.4× above national p90 | 5 pCi/L | '12'13'14'15'16'17'18'19 |
DICHLOROMETHANE worst: 2014 | 0.00367 mg/L within | 0.005 mg/L | '14 |
FLUORIDE worst: 2012 | 2.29 mg/L within | 4 mg/L | '12'14'15'16'17'18'19 |
ARSENIC worst: 2012 | 0.000599 mg/L within below national p90 | 0.01 mg/L | '12 |
SELENIUM worst: 2012 | 0.00252 mg/L within | 0.05 mg/L | '12 |
BARIUM worst: 2017 | 0.0588 mg/L within below national p90 | 2 mg/L | '12'14'15'16'17'18'19 |
HAA5 worst: 2012 | 0.0015 mg/L within | 0.06 mg/L | '12 |
TTHM worst: 2012 | 0.001 mg/L within | 0.08 mg/L | '12 |
NITRATE worst: 2019 | 0.06 mg/L within | 10 mg/L | '19 |
NITRATE NITRITE worst: 2019 | 0.06 mg/L within | 10 mg/L | '19 |
XYLENES TOTAL worst: 2013 | 0.00181 mg/L within | 10 mg/L | '13'14 |
URANIUM worst: 2019 | 0.000521 ug/L within below national p90 | 30 ug/L | '19 |
COPPER worst: 2012 | 0.0798 mg/L below national p90 | — | '12'14'17'18 |
LEAD worst: 2014 | 0.0111 mg/L | — | '14'17'18 |
DBAA worst: 2012 | 0.0015 mg/L | — | '12 |
BROMOFORM worst: 2012 | 0.001 mg/L | — | '12 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ManganeseA naturally occurring metal from soil and rock. | 0–200 ug/LRangeSystem-wide | 150 ug/LMCLG | At or above the limit |
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 4.24 ug/LReported levelSystem-wide | 100 ug/LMCLG | Within the limit |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | 0.00934 mg/LReported levelSystem-wide | 5 mg/LMCLG | Within the limit |
| SodiumA naturally occurring salt component. | 119000 ug/LReported levelSystem-wide | None set | Detected — no federal limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 2.2 mg/LReported levelSystem-wide | 4 mg/LMRDLG | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Cyanide | 2.8 ug/LReported levelSystem-wide | 200 ug/LMCLG | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 3.92 pCi/LReported levelSystem-wide | 0 pCi/LMCLG | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Benzo(a)pyrene | 0–20 ng/LRangeSystem-wide | 0 ng/LMRDLG | Detected — no federal limit |
People also ask about Joliet, IL's water
+Is Joliet, IL tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Joliet, IL water utility lists 1 contaminant at or above the federal limit: Manganese. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Joliet, IL tap water?
16 contaminants were measured in Joliet, IL's 2024 Consumer Confidence Report, spanning metals, radionuclides, and inorganic chemicals. 15 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Joliet, IL tap water?
One contaminant in Joliet, IL's 2024 report sits at or above the federal limit: Manganese (1.3× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Joliet, IL tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Manganese, at 1.3× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Joliet, IL's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Joliet, IL's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.